* Improved the caching mechanism.
* Fixed a bug that caches for the search unit type renewed in the background were not saved properly with the right name.
* Fixed a bug that caches durations for the search unit type were not set properly.


git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@865786 b8457f37-d9ea-0310-8a92-e5e31aec5664
Corrected some description in comments.

git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@865797 b8457f37-d9ea-0310-8a92-e5e31aec5664
Changed the version number to 2.0.4.

git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@865803 b8457f37-d9ea-0310-8a92-e5e31aec5664
Marked 2.0.4 as stable.

git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@865806 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Added the ability to use an image when no product is found for the search unit type.
* Fixed a bug with the search unit type that results of the same API request but with a different locale were saved with the same name.
* Fixed a bug with the search unit type that same products were stored in the response array when more than 10 items were set.


git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@868123 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Fixed a bug with the Auto-insert feature that set page type for the `Where to Enable` section did not take effect.

git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@868168 b8457f37-d9ea-0310-8a92-e5e31aec5664
Changed the version to 2.0.4.1.

git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@868263 b8457f37-d9ea-0310-8a92-e5e31aec5664
Marked 2.0.4.1 as stable.

git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@868266 b8457f37-d9ea-0310-8a92-e5e31aec5664